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carbon dating

n.
1.a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14

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    Idiom of the Day

    up to (a certain amount or number)
    until, as far as a certain amount or number, approaching a certain amount or number
    There were probably up to thirty people at the meeting.



    1.
    We often hear that such and such a piece of information cannot be released into the public ________ in the interest of national security.

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